U.S. stock futures got support from a duo of reports, which showed a surprise drop in weekly jobless claims and a rise in retail sales in February.Futures for the S&P 500 index rose 4.2 points to 1,871.90, while those for the Dow Jones Industrial Average added 31 points to 16,370. Futures for the Nasdaq-100 index added 12 points to 3,718.75.